Hot air heating furnace



May 2L w35 C, MURDOCK ET AL 2,002,295

H01 AIR HEATING FURNAGE Filed July 20, 1931 2 Sheets-Sheet 1 INVENTORS um HJM um' t m ATTORNEYS May 21, 1935 y C. MURDocK ET Al. 2,002,295

y i HOT AIR HEATING FURNACE Filed July 2o, 1951 2 sheets-sheet 2 INVENTOR/S Y um/mmm ffm/o ATTO RN EY,S

Patented MayA 21, k1935 Charles I. Murdock, Ann4 Arbor, andCharles, C. Cobb, Lansing, Mich.,

assignors to, Dail Steel 'Products Company, Lansing, Mich., a corporation of Michigan Application July 20, 1931, serial No. 552,008 ,'z claims. `(o1. 1z0-105) The invention relates to hot air heating furhaces.` of' that type in which the heated air is mcchanically propelled to the variouspoints of distribution. lIt is the object of the invention to 5 obtain a construction in which this is effectively accomplished with the further provision for washing and" humidifying the airentering the heater. To this end the invention consists in the construction as hereinafter set forth.

f In thedrawings:

Figure l is a perspective view ofv my Vimproved heater;

`:ligure 2 is asimilar view with a portiony of the outer jacketremoved to show the air propeller and its arrangement within the heater; Figure 3 is a cross-section through the furnace.

` Our improvements are applicable to various types of hot air heating furnaces, but they are particularly adapted'for use in connection with a furnace of the following construction:

A is a cylindrical casing forming the combustion chamber and where solid fuel isyused, the ash pit. B is an upward extension of the casing which tapers to an apex C and D are down draft flues arranged upon opposite sides of the casing B and spaced therefrom.r 'Iheseflues D are connected at'their upper ends to the casing B by laterally extending nipples E' while at their lower ends they are connected to a header casing F which leads to the chimney nue. rIhus the hot gases of combustion in passing upward through the casing B and downward through the iiues D transfer a large portion of their heat to the surjacket G.

To increase the emciency of a furnace such as just described we provide means for mechanically propelling the air. This means consists in a fan or air impeller H which is arranged at the top of the furnace above the apex C and enclosed within the rjacket G. For supporting the fan there is arranged within the jacket a suitable frame or stand I. J is the rotor shaft journaled in a bearing K on this stand and L is an electric motor or other driving means which may be arranged outside of the jacket G. The fan or blower is preferably provided-with two spaced housings with a single shaft J passing therethrough. The air propelled by the fan is sucked in through openings in the side of the housings concentricl with the shaft which openings are in free communication with the body of heated air which rises Within the jacket G between the fines D and the tapering casing B.

The cold air is preferably admitted to the rounding air which is enclosed within an outer jacket G on opposite sides thereof through conduits M'. These conduits are open attheir upper Vends'and'at their lower ends have lateral exten-` sions M. which pass through the jacket G. -Within each of the conduits M is preferably arranged 5 a water jet N' which washes and 'humidifies the air passing 'through the conduit. The surplus water collects in a pan O at the bottom of each conduit from which it may Vdrain outward through an aperture or conduit P.

With the construotionas described the heated air is positively propelled by the fan` or .propeller H to the various points'of distribution. On the other hand theV cold air entering through the conduits M is permitted to distribute itself around the heating surface, being drawn upwardly by the fan H. This secures the greatest Yefficiency from all portions of the heating surface and avoids the forming of short out passages 'of air through the jacket G. f

The air impeller and its supporting frame are not directly connected with the furnace or the jacket G and require no modification in the constructionof the latter. It is also obvious that this construction is adapted for use in connection with other types of hot air furnaces, it being only necessary to provide space within the upper portion of the jacket to receive a blower.

It will be noted that the blower while arranged within the jacket and adjacent to the furnace is nevertheless mechanically detached from these parts and is independently supported by a frame rising from the base. This has the important advantage that vibrations incident to the operation of the blower are not transmitted to either the furnace or the jacket, thereby avoiding resonance which would augment the noise.

What we claim as our invention is:

l. The combination of a base a hot air heating furnace mounted on said base a jacket for enclosing said furnace a skeleton frame mounted on said base separate from the furnace and arranged within said jacket and an air impeller mounted on said frame within the upper portion of said jacket. Y

2. In a warm air furnace a central nre box with an` upward extension, a series of downwardly extending flues on opposite sides of said upward extension, laterally extending conduits between said upward extension and the tops of said flues, a casing surrounding said ues forming a confined air space extending between said series of iiues, a blower between said opposite flues and above said laterally extending conduits adapted t0 draw air upwardly and means 55 vided with spaced upwardly extending and downwardly extending flues for the hot gases of combustion, a jacket enclosing said furnace, a skeleton frame mounted on said base independently of said furnace and arranged in the space between said upwardly and downwardly extending ues, an air impeller mounted on said frame within the upper portion of said jacket and connected to the distributing conduits and a motor for driving said impeller mounted independently of said furnace and out of the path of said hot gases of combustion. v

4. In a warm air furnace, a central re box with an upward extension, a series of downwardly extending nues on opposite sides of said upward extension, laterally extending conduits between said upward extension and the tops of said ues, a casing surrounding said nues forming a conned air space extending between said series of flues, a plurality of axially aligned blowers arranged between said opposite flues and above said laterally extending conduits and means for supporting said blowers having no direct mechanical connection with the said parts.

5. A warm air furnace comprising a base, a rectangular casing, a central fire box with an upward extension, a series of separate vertically extending flues for the hot gases of combustion on opposite sides of said central re box, each series extending lengthwise of said rectangular casing and substantially parallel thereto, laterally extending conduits between said upward extension and the tops of each of said vertical conduits, a series of coaxially arranged blowers within said casing between said series of vertical flues and above said laterally extending flues, the axis of said blowers extending longitudinally of said casing, a skeleton frame mounted on said base and having no direct mechanical connection with said other parts forming a support for said coaxially arranged blowers and a motor for driving said blowers mounted independently of said furnace and out of the path of said hot gases of combustion.

6. In a warm air furnace, a central re box with an upward extension, a series of downwardly extending Iiues on opposite sides of said upward extension, laterally extending conduits between said upward extension and the tops of said flues, a casing surrounding said lues forming a confined air space extending between said series of nues and having a wall closely adjacent certain of said flues, a blower for drawing the warm air through said casing, a downwardly extending cold air supply conduit having its lower end communicating with said confined air space, said conduit having one side thereof in heat-conducting relation to said wall whereby the temperature within said supply conduit is raised by heat from said flues and water-spraying means within said supply conduit for humidifying the air after the temperature is raised. Y

7. In a warm air furnace, a re box, flues extending from said re box, a casing surrounding said flues forming a confined air space and having a wall closely adjacent said flues, a blower for drawing the warm air upwardly through said confined air space within said casing, a downwardly extending cold air supply conduit having its lower end communicating with said confined air space, said conduit having one side thereof in heat conducting relation to said wallwhereby the temperature within said supply conduit is raised by heat from said flues and water-spraying means within said supply conduit for humidifying the air after the temperature is raised.

CHARLES I. MURDOCK. CHARLES C. COBB. 

